Expression of microRNA-26b, an obesity-related microRNA, is regulated by free fatty acids, glucose, dexamethasone and growth hormone in human adipocytes

Abstract

MicroRNAs (miRNAs) are short non-coding RNAs that are involved in numerous biological processes, including obesity and insulin resistance. miR-26b is an obesity-related intronic miRNA located in the intron of the carboxy-terminal domain, RNA polymerase II, polypeptide A, small phosphatase 1 gene. miR-26b is abundantly expressed in mice and mature human adipocytes, and is associated with the expression of adipokines. In the present study, the effects of energy-source materials and hormones associated with obesity, on miR-26b expression were investigated. It was demonstrated that free fatty acids (FFAs), glucose, glucocorticoids and growth hormone (GH) downregulate the expression of miR-26b in human adipocytes. The results indicate that the expression of miR-26b is affected by a variety of factors that are correlated with obesity and insulin sensitivity. Therefore, miR-26b may be an important mediator in the development of obesity-associated insulin resistance.